The contract was awarded through the Improvement & Efficiency South East (IESE) construction framework. It is the third school project undertaken by Osborne on behalf of Hounslow in recent months.
The existing Catherine Par House will be demolished, with a new two-storey block linked to the main building. The project also includes extending the main building and refurbishing existing spaces to improve facilities.
Completion is scheduled for July 2016
Osborne director for education John Craig said the improvements were “much needed and will offer staff and pupils alike a great facility".